Mako Mermaids: During a trip to Mako Island, 16-year-old Zac gets in touch with the water of the magic Moon Pool in a night of full Moon, gaining a mermaid tail and the power to manipulate water. Sirena, Nixie and Lyla, three mermaids who guard Mako Island, are sent to mainland by their fellow mermaids to deprive Zac of his powers, otherwise they will be forever banned from the island.